Platen printing-press



0. JOHNE.

PLATEN PRINTING PRESS.

APPLlCATION FILED MAR. 31, 1914.

"1,399,431. Patented Dec. 6, 1921.

UNITED OTTO JOHNE, OFBAUTZEN, GERMANY.

PLATEN PEINTIFG-PRESS;

tent. I Patented Dec. 6, 1921.

. Serial No. 828,449.

(GRANTED UNDER THE PRGVISIONS 01? THE ACT 91* MARGH 3, 1921, 41 STAT. L,1313.)

T 0 all whom it may concern. 7

Be it known that 1,.Orro JOHNE, a citizen of the Kingdom of Saxony,German Empire, residing in Bautzen, in the Kingdom of Saxony, in saidEmpire, have invented certain new and useful Improvements in PlatcnPrinting-Presses, of which the following is a specification.

The present invention relates to a platen printing press, which isprovided with a laying-on and laying-off attachment to which the sheetis fed, either by hand or by mechanical means. The printed sheets are,however, automatically laid off.

In the known platen printing presses with automatic laying-on andlaying-off attachments, the grippers reciprocate over the surface of theplaten or travel around the platen in circular or curviform guides.

The present invention difiers from such known arrangements by itsobvious simplicity, and affords the great-advantage, that the platen isdirectly accessible for arranging the forms, and that the speed of themachine or of the movement of the grippers can be considerablyincreased.

The invention is exemplified in the accompanying drawings, in whichFigure 1 is a diagrammatic view showing a printing press embodying oneform of my invention, showing the same in open position, and

Fig. 2 is a similar view showing the same in closed position.

The machine is driven in the well known manner from the flywheel shaft.Also the platen is actuated in the well known manner, by means of thelink 3, so that it rocks about the bearing 5, the platen operating toprint once for every revolution of the flywheel by means of gearsoperated by the flywheel shaft, but not shown in the drawings. Theplaten it will be noted moves through a given are.

The novel feature of the present arrangement consists in that above theplaten l grippers 7, 8, 9 on the arms 6 move in a circular path tosuccessively draw the sheet away from a laying-on table 10 arrangedabovethe platen, bring it into printing position, and then again lay it offon the laying-off table 11 which is likewise arranged above the platen.

It is to be understood that the representatlon of the drawings anddescription is diagrammatic in its nature, and does not show the knownand familiar parts for manipulating the grippers and for opening andclosing l zhem, as this is well known in the art and .LOI'IHS no part ofthis invention. The support formed by the arms 6 carrying the grippers7, 8, 9 is adapted to be turned in the direction indicated by the arrowshown in Fig. 2, by any suitable mechanism, parts of which arerepresented in th drawing by the near- C) ng 20, 21, 22, 23. In theparticular case illustrated there are three grippers at equal distancesfrom each other, so that if the support 6 is rotated through an angle of120 from the position shown in Fig. 2, the grip-- per 8 will come to theposition shown for' the gripper 7, while the latter will at the sametime move up to the position shown for the gripper 9, and thislastnamed'gripper will move simultaneously to the position shown for thegripper 8. In other words, a one-third revolution of the gripper-support6 from the position shown in Fig. 2, in the direction of the arrow, willbring about simultaneously the following three actions, all occurringduring the movement of the platen 4: First, the gripper 7 will lift thesheet just printed and carry it up to the laying-off table 11, on whichsuch sheet is deposited; second, the gripper 8 will carry an unprintedsheet from the laying-on table 10 to the printing position; and third,the gripper 9, without any paper, will be moved to the proper positionto receive an unprinted sheet from the laying-on table 10 (same positionas gripper 8 in Fig. 2). The slots 6 at the ends of the grippersupporting arms 6 perform certain functions in causing the grippers toopen and close, and form no part of my invention.

The arrangement of the gripper support 6 and of the laying-off table 11above the platen 4 is of great advantage as the platen is thus readilyaccessible.

I claim- 1. A platen printing press comprising a platen having ato-and-fro movement, a laying-on table, a laying-off table, gripper armsmounted on a revoluble shaft independent of and spaced from said platen,said revoluble shaft being free from the said to-and-fro movement ofsaid platen, and. grippers mounted on said gripper arms, said gripperspassing adjacent said platen, said.

layingon table, and said laying-01f table during the revolution of saidgripper arms, said grippers being adapted to draw the sheet from thelaying-on table, support the same in hanging position, place it intoprint ing position on said platen,and again remove it and lay it off onthe laying-off table, the direction of movement of the gripper armdrawing the sheet from the laying-0n table being the same as thedirection of movement of the saidplaten.

2. A platen printing press comprising a platen having a to-and-fromovement, gripper arms mounted on a revoluble shaft, said shaft beingindependent of and spaced from said platen, and free from thesaid'to-andfro movement of said platen, means for revolving said shaftduring the movement of the said platen, grippers carried on said gripperarms, a laying-on table anda layingoff table, said grippers passingadjacent said laying-on table, said platen, and said layingoff table,during the revolutionthereof, said grippers being adapted to draw thesheet rom the laying-on table,place it-into printin position, and againremoveit and lay it ofi onto the laying-off table.

3. A platen printing press, comprisinga platen havingato-and fromovement, a laying-on table, a laying oif table, and a feeding mechanismfor taking the sheets from the laying on table, placing it into printingposition, and again removing said sheet and placing it on saidlaying-off table, the structure of said feeding mechanism beingindependent of the structure of said platen,- and removed from thesurface thereof, and free mechanism for takingthe sheets from the Llaying-011 table, placing the same in printlng position upon the bedof-said press, and again removing sald' sheet and placing 1t on saidlaying-off table, said feeding mecha-r nism being rotatable entirelyinfront of said bedof said'machine, saidlaying-on and lay- V ing-offtables and said feeding mechanism being disposed above sa d'platen. Intestimony'that I claim the foregoing as my invention, I; have signedlnyname in 1 presence of two subscribing Witnesses.

- OTTO JOHNE. Witnesses: V r

V Gns'rlw MfiLLnR,

LE0 A. BERGHOLZ.

